Chennai: Heavy to very heavy rains pounded Chennai and the suburbs on Thursday, inundating roads and subways and three persons were killed in rain-related incidents here. Three persons (two women and a boy) died of electrocution here, Minister for Revenue and Disaster Management, KKSSR Ramachandran said. It was a repeat of scenes witnessed here last month as motorists struggled to manoeuvre their vehicles on flooded roads and subways while showers led to traffic congestion in the city and suburbs.